Prefabricated House Grade Comparison Table

The commonly used concrete grades and their applicable scenarios for prefabricated houses are as follows:

1. C25～C30 Scope of Application: Large-span structures, structures with high durability requirements, and prefabricated components (such as prefabricated floor slabs for ordinary residential and office buildings). Description: C30 is the most common grade in prefabricated houses, especially suitable for prefabricated floor slabs in ordinary residential and office buildings. Its strength can meet the requirements of conventional loads, such as human activities and furniture loads, while also considering economy and construction convenience. The C25 grade has slightly lower strength and is suitable for prefabricated components with smaller loads, but it is not a mainstream choice.

2. C40～C45 Scope of Application: Prestressed reinforced concrete components, crane beams, and special structures (such as industrial plants, underground garages, or floor slabs with heavy loads). Description: In industrial plants that need to withstand heavy equipment, stacking, or vibration loads, grades C40 and above are often used. For example, crane beams need to resist dynamic loads, and underground garages need to cope with soil pressure and vehicle loads, both requiring higher-strength concrete. The C45 grade further enhances compressive and crack resistance, making it suitable for scenarios with extremely high structural safety requirements.

3. Supplementary Explanation for Other Grades

• C20～C25: Suitable for beams, slabs, and columns in ordinary reinforced concrete structures, but not mainstream grades for prefabricated houses. These grades are mostly used for on-site poured low-rise buildings or temporary structures, and are rarely used in prefabricated components.
• C50 and above: Mainly used for high-rise buildings over 30 floors or special projects (such as large-span bridges and nuclear power plant containment structures). Prefabricated houses rarely involve such high grades due to their high cost and complex construction techniques. They may only be used under extreme load conditions (such as foundations for super-heavy industrial equipment).

Key Conclusions: The selection of concrete grades for prefabricated houses should be based on the structural type and load requirements. Ordinary residential buildings should prioritize C30, balancing performance and cost; industrial buildings or scenarios with high load requirements (such as plants and underground garages) can choose grades C40 and above; grades C20～C25 and C50 and above are rarely used in prefabricated houses and should be selected with caution based on specific engineering conditions.